new jersey new york and connecticut were the hardest hit. they're also home to some of the biggest names in music. >> i was here during the storm. it was scary. >> to witness my city and the tri-state area really going through something where nobody could control it. >> this was just complete and entire buildings washed away into the sea. >> reporter: 121212, the concert for sandy relief at madison square garden is being called one of the biggest music events of all time. >> we called bruce springsteen and paul mccartney and they said yes immediately. >> reporter: the last time producers managed to bring this many big names together, it was after 9/11. ♪ i've seen the lights go out on broadway ♪ >> reporter: 121212 has already raise third degree $2 million in sponsorship before a single note has been played. >> rolling stone, who, kanye west alicia keys eric clapton, and other surprise guests. it's the greatest concert of all time. >> reporter: 121212 will be broadcast to an estimated 200 million homes in 190 countries worldwide via tv a